What gives?!

Just opened up my order from PHF today. 2 Ment and 5 Trenavar. Everything looks good, but I opened up one of the packs of Trenavar because it looked different than the other, and in fact, it was. It only had 67 caps in it. So then I freaked out and checked everything else which were all correct, so now I have to deal with the issue of preserving freshness, but that's my own fault really.

Point being, is there a way I can rectify this pack of Trenavar having only 67 caps in it? Or is there a reason that happened? I'm confused. Did I shoot myself in the foot by opening it?